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Structural Beam Design Guide

This document provides design specifications and calculations for reinforcing a 200x300mm concrete beam with a 4m span. Key details include: - The beam is analyzed as singly reinforced based on its maximum moment capacity of 64.61kN-m exceeding the applied load of 38.15kN-m. - The required steel reinforcement includes 5 bars of 16mm diameter in tension and 9 bars of 12mm diameter in compression. - Calculations determine the steel ratios and amounts based on material properties like yield strength and concrete compressive strength.

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55 views2 pages

Structural Beam Design Guide

This document provides design specifications and calculations for reinforcing a 200x300mm concrete beam with a 4m span. Key details include: - The beam is analyzed as singly reinforced based on its maximum moment capacity of 64.61kN-m exceeding the applied load of 38.15kN-m. - The required steel reinforcement includes 5 bars of 16mm diameter in tension and 9 bars of 12mm diameter in compression. - Calculations determine the steel ratios and amounts based on material properties like yield strength and concrete compressive strength.

Uploaded by

KULOT
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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B3

Design Specs
dbot = 74 say 90
Beam Size = 200 x 300 fy = 230
Beam Span = 4 m fc' = 27
Liveload = 1.9 KN d = 210
Slab = 3 KN/m2 α = 96.78
Side of Slabs = 1 sides d' = 75
Wt of Beam = 1.44 KN/m
Wt of Partition = 7.32 KN/m
m = 0.500
l = 4
s = 2

Design
A Load Analysis;
W = 7.43 KN/m2

We = 6.81 Kn/m

Wu = 19.07 Kn/m

Mu = 38.15 Kn-m

B Verify if Singly or Doubly Reinforced

ρmax = 0.75((.85^2*fc'/fy)(600/(600+fy))

ρmax = 0.0460

ρb = As/bd ----------> ρmax = Asmax/bd

Asmax = 1931.33 mm2

Max moment Capacity

Mu = 64.61 Kn-m

Applied Load Ultimate Load


38.15 64.61

Required Strength < Design Strength

Therefore; Analyze as Singly Reinforced Beam

C As1 = Asmax = 1931.33 mm2

Mu2 = -26.46 Kn-m excess load

c = 113.86 mm2

Extra Steel (As2)

As2 = -946.87 mm2

Tension Bars

As = As1 + As2
As = 984.46 mm2

Compression Bar
fs' = 204.76

fs' > fy therefore; Steel will not yeild

use fs' = fy = 230 Mpa

As'fs' = As2fy

As' = -946.87 mm2

Number of Rebars

Tension Bars use 16 mm deform bar

no of bars = 4.90
say 5 pcs - 16 mm deform bar

Compression Barsuse 12 mm deform bar

no of bars = -8.37
say -9 pcs - 12 mm deform bar

Therfore: USE 200 X 300 R.C. BEAM


with 5 pcs 16 mm Tension deform bar
and -9 pcs 12 mm Compression deform bar

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